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    Function toMatchLeft

    • Asserts that the left side of an Either matches a value, partial object, or regular expression.

      Parameters

      • actual: unknown
      • expected: RegExp | AsymmetricMatcher

        Pattern, partial object, or asymmetric matcher for the left.

      Returns MatcherResult

      import { left } from 'fp-ts/lib/Either'

      test('passes when left of Either matches an object', () => {
        const actual = left({ test: 'ok', foo: 'bar' })
        expect(actual).toMatchLeft({ test: 'ok' })
      })

      test('passes when left of Either does not match an object', () => {
        const actual = left({ test: 'unexpected', foo: 'bar' })
        expect(actual).not.toMatchLeft({ test: 'ok' })
      })

    • Asserts that the left side of an Either matches a value, partial object, or regular expression.

      Type Parameters

      • L

        Type of the left value contained in the Either.

      Parameters

      • actual: unknown
      • expected: AsymmetricMatcher | Partial<L>

        Pattern, partial object, or asymmetric matcher for the left.

      Returns MatcherResult

      import { left } from 'fp-ts/lib/Either'

      test('passes when left of Either matches an object', () => {
        const actual = left({ test: 'ok', foo: 'bar' })
        expect(actual).toMatchLeft({ test: 'ok' })
      })

      test('passes when left of Either does not match an object', () => {
        const actual = left({ test: 'unexpected', foo: 'bar' })
        expect(actual).not.toMatchLeft({ test: 'ok' })
      })

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